High-Pressure Fuel Pump

Abstract

A high-pressure fuel pump includes a pump housing, a pump piston accommodated in a receiving opening of the pump housing, a high-pressure seal which surrounds the pump piston in a sealing manner and which seals off a high-pressure region from a low-pressure region, and a guide device which comprises at least two guide portions that are axially spaced apart from one another and guide the pump piston with a sliding fit. The at least two guide portions are arranged in the receiving opening of the pump housing. A first guide portion is arranged, as seen in an axial direction, on a side of the high-pressure seal facing toward the delivery space. And a second guide portion is arranged, as seen in the axial direction, on a side of the high-pressure seal facing away from the delivery space.

1 . A high-pressure fuel pump, comprising:
 a pump housing defining a receiving opening;   a pump piston which is received in the receiving opening;   a high-pressure seal which sealingly surrounds the pump piston and which is configured to seal off a high-pressure region with respect to a low-pressure region; and   a guide device which includes at least two guide portions which are spaced apart from one another axially and which are configured to guide the pump piston with a sliding fit,   wherein the at least two guide portions are arranged in the receiving opening of the pump housing,   wherein a first guide portion of the at least two guide portions is, as viewed in an axial direction, arranged on a side of the high-pressure seal pointing toward a delivery chamber, and   wherein a second guide portion of the at least two guide portions is, as viewed in the axial direction, arranged on a side of the high-pressure seal averted from the delivery chamber.   
     
     
         2 . The high-pressure fuel pump as claimed in  claim 1 , wherein at least one of the at least two guide portions, and the high-pressure seal are provided on a preassembled arrangement which is arranged in the receiving opening of the pump housing. 
     
     
         3 . The high-pressure fuel pump as claimed in  claim 2 , wherein the preassembled arrangement comprises a sleeve, in or on which the at least one of the at least two guide portions, and the high-pressure seal are arranged. 
     
     
         4 . The high-pressure fuel pump as claimed in  claim 3 , wherein:
 the at least one of the at least two guide portions is formed integrally with the sleeve, and   the high-pressure seal is received in the sleeve.   
     
     
         5 . The high-pressure fuel pump as claimed in  claim 3 , wherein the at least one of the at least two guide portions is pressed into the sleeve. 
     
     
         6 . The high-pressure fuel pump as claimed in  claim 1 , wherein the first guide portion and the second guide portion are of identical configuration. 
     
     
         7 . The high-pressure fuel pump as claimed in  claim 1 , wherein at least one of the at least two guide portions is, as viewed in an axial direction, of symmetrical configuration relative to a central plane. 
     
     
         8 . The high-pressure fuel pump as claimed in  claim 1 , wherein said high-pressure fuel pump has a first fluidic connection which fluidically connects a first region which is adjacent to a first end surface of the first guide portion, to a second region which is adjacent to a second end surface of the first guide portion. 
     
     
         9 . The high-pressure fuel pump as claimed in  claim 8 , wherein said high-pressure fuel pump has a second fluidic connection which fluidically connects a third region which is adjacent to a first end surface of the second guide portion, to a fourth region which is adjacent to a second end surface of the second guide portion. 
     
     
         10 . The high-pressure fuel pump as claimed in  claim 8 , wherein the first fluidic connection and/or the second fluidic connection comprises at least one fluid channel, which extends altogether in an axial direction through the respective guide portion, and/or comprises a groove, which extends altogether in an axial direction, in a radially inner lateral surface of the respective guide portion, and/or, if the guide portions are arranged in a sleeve, comprises a flattening or a groove on a radially outer lateral surface of the sleeve. 
     
     
         11 . The high-pressure fuel pump as claimed in  claim 10 , wherein the fluid channel and/or the groove is arranged obliquely relative to a longitudinal axis of the first and/or second guide portion. 
     
     
         12 . The high-pressure fuel pump as claimed in  claim 1 , wherein the at least two guide portions and the high-pressure seal are pressed directly into the receiving opening of the pump housing. 
     
     
         13 . The high-pressure fuel pump as claimed in  claim 1 , wherein at least one of the at least two guide portions and the high-pressure seal are provided on a preassembled arrangement which is press fit into in the receiving opening of the pump housing.